Author/Authors :
Grigorova، نويسنده , , V. and Semerok، نويسنده , , A. and Farcage، نويسنده , , D. and Weulersse، نويسنده , , J.M. and Thro، نويسنده , , P.Y. and Gauthier، نويسنده , , E. and Roche، نويسنده , , H. and Loarer، نويسنده , , Th. and Grisolia، نويسنده , , Ch.، نويسنده ,
Abstract :
This paper discusses feasibility and tests of a new method for in situ temperature measurement of tokamak plasma-facing metallic surfaces under plasma presence. In such conditions, the other temperature-measurement methods are not applicable due to the perturbing thermal radiation reflected by the walls. Our approach overcomes this limitation by looking with two pyrometers to the measured surface while thermally perturbed. Because of the thermal perturbation each pyrometer records a signal modulation. The temperature, deduced by the ratio between the two signal modulations is dependent neither on the environmental reflecting fluxes nor on the surface emissivity. Originally, the measured temperature is linked to the signals ratio via the experimental set-up parameters. Here, we proposed an alternative way to deduce it from the pyrometers calibration data only. With this method we obtained temperature measurements with accuracy better than 90%.
